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(No Model.) 4 Sheets-Sheet 1.

W. HOLMES. I

MANDRBL FOR FORMING PNEUMATIC TIRES. I No. 543,093. Patented July 23,1895.

. 4 Sheets-Sheet 2.

(No Model.)

W. HOLMES. I MANDREL FOR FORMING PNEUMATIG TIRES; No. 543,093.

Patentd July 23, 1895.

(No Model.) 4 Sheets-Sheet 3.

W. HOLMES. MANDRBL FOR FORMING PNEUMATIC TIRES.

No. 543,093. Patented July 23, 1895.

(No Model.) 4 Sheets--Sheet 4.

y W. HOLMES. MANDREL FOR FORMING PNEUMATIG TIRES. No. 543,093. PatentedJuly 23, 1895.

,Nr'rnn ST TES" WILLIAM HOLMES, OF CHICAGO, ILLINOIS, ASSIGNOR TO FREDW. MORGAN AND RUFUS WRIGHT, OF SAMEPLAOE.

MANDREL FOR FORMING PN EUMATIC TIRES.

SPECIFICATION forming part of Letters Patent o. 543,093, dated July 23,1895.

Application filedApril 2,1895. SerialNo. 544,130. on, model.)

To all whom it may concern.-

- matic-Tire Sheaths, of which the following is a specification. a

My invention consists in an improvement uponthe mandrels described inLettersPatent of the United States Nos. 490,035 and 496,321, granted andissued to Fred W. Morgan and Rufus Wright. In practice these annularmandrels have been madepf metal, and in order to permit the.removal ofthe removable section it has been customary to spring the mandrel bymeans of a lever, as described in said patents; but in time the mandrelfrequently becomes sprung as a result of the thus repeatedly springingit for the foregoing described purpose. This is objectionable, since itis highly desirable that the mandrel should preserve'a perfectly-truecircular form, for if sprung or bent out of a true circle the sheathafter having been molded upon the mandrel will be thicker in someportions than other portions, which will be pinched 'too closelybetween'the mandrel and the wall of the mold.

The object of my invention is to overcome such objectionable feature; toeconomize in the time and labor employed in removing the sheath from themandrel; to save time in handling and manipulating the mandrel, and totemporarily lock together the movable man-' drel-section and theremaining portion of the mandrel, so as to practically form a solidring, and to avoid gaps betweenthe ends of the section and the ends ofthe remaining portion of the mandrel.

To the attainment of the foregoing and other useful ends, I constructthe mandrel as hereinafter set forth.

is locked in place.

showing the swiveled section turned to one side. Fig.4 shows,on a largerscale, the free end of the section and adjacent end of the main portionof the mandrel, partly in section, so as to expose the tongue'and latch,which are understood to be concealed when the section the section on adifferent plane. Fig. 6 is a like view showing the oppositeend of theswiveled section. I Fig. 7 shows the swivel-pin. Fig. 8 is'a viewsimilar to Fig. 6 with the section taken on a difierent plane. Fig. ,9is a cross-section on line x 00 in Fig. 6. Fig. 10 is a perspective viewshowing the swiveled section turned to one side and illustrating apneumatic-tire sheath havinga short split and partially removed from themandrel.

Fig. 5 is a like view with Fig. 11-

is a similar view illustrating one end of the main portion of themandrel emerging from the short split in the sheath.

The annular mandrel A is preferably made of metal, so as to insuredurability and sufficient rigidity to permit a pneumatic -tire sheath tobe accurately formed upon it. Material having substantially theforegoing-mentioned properties of metal could be employed, it beingobserved, however, that since no elasticity need be present in the'mandrel it is preferably rigid, and that such rigidity is desirable,since it insures'the accurate formation of the annular chamber withinthe sheath ,of a pneumatic tire and also insures'uniformity in thesheath. The annular cylindric mandrel shown is in transverse sectionalarea adapted to the required form and size of the annular bore orchamber in a pneumatic-tire sheath, and by forming it of metal it canhave a hard and smooth surface, whereby the sheath can be stripped offwith comparative ease.

The swiveled section 1 of the mandrel forms, when locked in place, apractically solid portion of the mandrel, as in Fig. 1; One end of thissection is connected with the remaining portion or body 2 of the mandrelby a swivel-joint. The swivel-joint between the section and body of-themandrel can be variously constructed; but, as a simple and highlyeflicient arrangement I provide a swivel-pin B, having one portionfitted within a socket 3 in thesection and its remaining portion fittedwithin a socketet in the body or remaining portion 2 of the mandrel. Theswivelpin is desirably lockedin the body of the mandrel, and to such endit can be fastened by a key 5. As a means for holdingthe pin inconnection with the section and at the same time permitting the sectionto turn about the pin the latter is provided with an annular groove 6,which receives a portion of a transverselyarranged stop 7. The keyillustrated in Figs. 6 and 8 is wedge-shaped, so that in case of wearbetween the abutting ends of the section and mandrel at the swivel-jointan adjustment can be made by slightly driving the key.

The opposite end of the swiveledsection is provided with a dovetailedblock 0, prefer ably of hardened steel, which is fitted within adovetailed mortise in the section. A portion of this block projects fromthe end of the section and engages in a dovetailed mortise 8 in the mainportion or body of the mandrel, and as a preferred way this mortise isprovided by a recessed block or bearing-piece D of hardened metal, whichis countersunk in the mandrel. I also desirably provide a latch fortemporarily locking the section in place, and to such end the mandrel isprovided with a recess 9, arranged in rear of the bearing D, so as toprovide space for a spring-latch E. As a simple construction, the latchE is backed by a spring 10 and has its engaging portion 11 arranged towork through an opening in the base of the bearing D, so as to normallyproject from such base, as in Figs. 4 and 5. Said engaging portion 11engages in a recess 12 in the section and can be rounded, so that whensuitable force is directed laterally against the section it will forceback the latch and turn upon its swivel-joint.

hen the swiveled section is locked in place, as illustrated in Fig. 4,with its dovetailed block or tongue 0 engaging in a dovetailed recess inthe body of the mandrel, it

will be rigid with the mandrel and the latter will as a whole bepositively held against spread or enlargement.

The sheath is formed or molded upon the mandrel when the section islocked in place, and to such end the endless tubular sheath is built orformed upon the mandrel by applyend of the mandrel adjacent to the latchcan be held by a vise or clamp, and the sheath can then be stripped fromthe mandrel.

In Fig. 10 the sheath is shown slipped back upon the swiveled section,so as to more clearly illustrate the fact that such section when swungto one side still forms a regular continuation of the mandrel, and thatthe only gap which occurs is between the body of the mandrel and thefree end of the swiveled section. In other words the result is as thougha heavy metal mandrel, transversely divided at one point, should bedeflected laterally, so as to open it at such point. Such deflection bybending a metal mandrel suitable for forming a pneumatic-tire sheathwould be impracticable, but by providing the swiveled section I can ineffect attain such end. The sheath could be removed by continuing themovement begun in Fig. 10; but in practice it is desirable to remove thesheath, as in Fig. 11, whereby the end of the body or main portion ofthe mandrel shown can be held by a clamp or vise, thus relieving theswiveled section from the weight which it would have to sustain if itwere held by the clamp or vise. hen the swiveled section is turned so asto open the mandrel, as in Figs. 3, 11, and 12,its swiveled end willcontinue to abut squarely against the adjacent end of the main portionof the mandrel, and no objectionable gap or angle, tending to preventthe ready slip of the sheath, will be formed; also, when the swiveledsection is in place its ends will abut closely and squarely against theends of the main portion or body of the mandrel, whereby noobjectionable gaps will occur.

"What I claim as my invention is-- 1. An annular mandrel having aswiveled section and adapted for the formation of an annular pneumatictire-sheath, whereby the bore is determined by the transverse sectionalarea of the mandrel, substantially as described.

2. An annular, cylindric, metal mandrel having a swiveled section, andadapted for the formation of an annular, tubular pneumatic tire-sheathwhereof the bore is determined by the transverse sectional area of themandrel, substantially as described.

3. The annular mandrel A for the purpose described, having a swiveledsection connected with the main portion of the mandrel by a swivel jointcomprising a swivel pin engaging in recesses in the section and mainportion of the mandrel and having a groove which receives a stop,substantially as set forth.

4. Theannular mandrel A for the purpose described, having a sectionwhich is swiveled at one end, the opposite end of the swiveled sectionand the adjacent end of the main portion of the mandrel being providedwith latching means, substantially as set forth.

5. The annular mandrel A for the purpose set forth, having a swiveledsection, and means for connecting the free end of the swiveled sectionwith the remaining portion of the mandrel, consisting of a dovetailedtongue and groove, substantially as set forth.

6. The annular mandrel A for the purpose ICG set forth, having a,section which is swiveled held and locked in place, substantially asdeat one end, and meansfor holding and lock-- scribed. ing together thefree end of the section and the adjacent end of the main portion of theWILLIAM HOLMES mandrel, comprising a dovetailed tongue and Witnesses:

groove and alatch,.said tongue and latch be- RETA M. WVAGNER,

ing concealed when the swivelcd section is ARTHUR F. DURAND.

